 | United States. Forest Service. California Region - 1937 - 408 páginas
...felt in walking against wind 32-38 ( 8 Gale Breaks twigs off trees ; generally impedes progress 39-46 9 Strong gale Slight structural damage occurs (chimney...experienced inland; trees uprooted ; considerable structural damage occurs 55-63 11 Storm Very rarely experienced: accompanied by widespread damage 64-75 12 Hurricane... | |
 | William J. Sutherland - 1996 - 354 páginas
...inconvenience felt in walking against wind 8 Fresh gale Twigs break off trees; progress generally impeded 9 Strong gale Slight structural damage occurs (chimney pots and slate removed) 10 Whole gale Seldom experienced inland; trees uprooted; considerable structural damage occurs 11 Storm... | |
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... 6 Strong breeze Large branches in motion ; whistling heard in telegraph wires ; umbrellas used with difficulty... 